comp: Allow compilation of paraview plugins directory

Changes

1) Optionally include into plugin qhull dependencies based on top-level conditional

2) Update rename of CosmologyToolsMacros -> CosmoToolsMacros

3) Add additional library includes in pv-plugins

4) Add system paths from fedora for FindQhull
comp: Fix typo in 64 bit path
Merge pull request #10 from gcasey/master

fix compilation of paraview plugin